Return-Path: Received: from rly-mh01.mx.aol.com (rly-mh01.mail.aol.com [172.21.166.137]) by air-mh05.mail.aol.com (v121_r5.5) with ESMTP id MAILINMH053-bb2496493be267; Wed, 07 Jan 2009 06:36:44 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mh01.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMH012-bb2496493be267; Wed, 07 Jan 2009 06:36:33 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LKWhI-0007aZ-70 for rs_out_1@blacksheep.org; Wed, 07 Jan 2009 11:35:40 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LKWhG-0007aQ-Sw for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 11:35:39 +0000 Received: from smtp-out-2.talktalk.net ([62.24.128.232] helo=smtp.talktalk.net) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LKWhF-00087p-97 for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 11:35:38 +0000 X-Path: TTSMTP X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AuUEAKsiZElOlWZt/2dsb2JhbACEVssHhXU Received: from unknown (HELO mal769a60aa920) ([78.149.102.109]) by smtp.talktalk.net with SMTP; 07 Jan 2009 11:35:22 +0000 Message-ID: <007401c970bc$0657a6e0$0301a8c0@mal769a60aa920> From: "mal hamilton" To: References: <4C86C347281247589F35AD0102675D4B@YOUR4DACD0EA75> Date: Wed, 7 Jan 2009 11:35:20 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Razor blade RX Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 Doc Its hard to believe so many people are missing the point. No one has yet mentioned how to make the device. How to set the RAZOR blade detector up and how to construct the EARPHONE needed. What is the impedence of the earphone and how a person would make one especially in 1940, although it would still apply today g3kev ----- Original Message ----- From: "Dr. Tom Gruis" To: Sent: Tuesday, January 06, 2009 10:34 PM Subject: RE: LF: Razor blade RX > Ah! > > Crystal sets! More of the joy of analog.... > > Doc, > > -----Original Message----- > From: owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe > Sent: Tuesday, January 06, 2009 15:54 > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: Razor blade RX > > Mal, > > I did build a "crystal radio" with a razor blade as detector when I > was 14 years old. > It had to be rusty to work properly and even then it was a very poor > detector. > And it is an AM detector, so not useable for ham signals on 500kHz. > > 73, Rik ON7YD - OR7T > > > Quoting mal hamilton : > >> Since I mentioned a Razor blade and fence wire RX a while back I >> have had several requests for a circuit. To give others the >> opportunity to submit a cct I will await replies. This method was >> used successfully at Coldiz and other POW camps to receive BBC >> broadcasts. >> Let us know how you would approach the subject. This is applicable >> to MF/LF since the broadcasts at the time were receicved on these >> bands. >> Build one and have a QSO using this RX >> g3kev >> > > > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.3/1879 - Release Date: 1/6/2009 5:16 PM